"Volkov and Vulchanov in particular seemed not to care whether their clubs made contact with Bludger or human as they swung them violently through the air."
-- watching the 1994 Quidditch World Cup (GF8)
Along with the other Bulgarian Beater Volkov, Vulchanov was a member of the Bulgarian team in 1994 that lost the Quidditch World Cup final to Ireland. The team included a very young Viktor Krum as Seeker. His other teammates were Dimitrov, Ivanova and Levski (Chasers), and Zograf (the Keeper) (GF8).
Ruthlessness and legendary beating skills
Other canon notes and references
A videogame with Famous Wizards cards gives him a first name of "Pyotr".
Lexicon list of Beaters
From the Web
Writing by J.K. Rowling on Pottermore:
Pottermore enhanced reading experience: Quidditch World Cup
Screenshots of the original Daily Prophet coverage of the 2014 Quidditch World Cup on Pottermore: Imgur archive
Harry Potter Wiki: Pyotr Vulchanov